CN105188232A - LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit - Google Patents
LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit Download PDFInfo
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Abstract
The invention discloses an LED (light-emitting diode) constant-current dimming circuit. The dimming circuit comprises a switching power supply module, a voltage sampling module, a current sampling module, a control module and a voltage regulation and feedback module, wherein the switching power supply module is used for supplying power to an LED load; the voltage sampling module is used for acquiring the output voltage; the current sampling module is used for acquiring the output current; the control module is connected with the voltage sampling module and the current sampling module; the voltage regulation and feedback module is connected with the control module and the switching power supply module; the control module is used for regulating the reference voltage output to the voltage regulation and feedback module according to the output voltage from the voltage sampling module and the output current from the current sampling module; the voltage regulation and feedback module is used for generating a corresponding voltage regulation signal according to the reference voltage and feeding the voltage regulation signal back to the switching power supply module so that the switching power supply module regulates the output voltage. The output voltage is regulated in real time by detecting the output current to achieve the function of setting the maximum constant current of the LED. The circuit has a simple structure and higher efficiency. Meanwhile, the invention also provides the corresponding LED constant current dimming circuit and a control method thereof.
Description
Technical field
The present invention relates to LED illumination control technology field, relate more specifically to a kind of constant current driver circuit for LED, light adjusting circuit and control method thereof.
Background technology
The various places that LED illumination is widely used in daily life because of advantages such as its energy-saving and environmental protection.Wherein, a large advantage of the feature of tunable optical LED illumination especially.At present, conventional LED lamp light adjusting circuit is all adopt prime DC constant voltage (CV) to export substantially, coordinates rear class constant current regulator (DC-CC) to realize.This scheme, due to needs two-stage, supposes that the conversion efficiency of every grade reaches 0.9, and so after two-stage, the highest namely 0.9*0.9=0.81 of whole efficiency of power supply, efficiency is lower.And if will realize multichannel light modulation, then need every road to be equipped with a constant current regulator (DC-CC), control the output current size of corresponding constant current regulator during every road light modulation, this will cause circuit structure comparatively complicated, and cost is higher.
Given this, be necessary to provide a kind of circuit simple and the constant current driver circuit for LED that efficiency is higher and light adjusting circuit and provide a kind of and raise the efficiency and simplify the circuit control method of circuit structure, thus address the deficiencies of the prior art.
Summary of the invention
A technical problem to be solved by this invention is to provide the simple and constant current driver circuit for LED that efficiency is higher of a kind of circuit.
Another technical problem to be solved by this invention is to provide the simple and LED constant current light adjusting circuit that efficiency is higher of a kind of circuit.
A technical problem more to be solved by this invention is to provide a kind ofly raises the efficiency and simplifies the circuit control method of circuit structure.
In order to solve the problem, the invention provides a kind of constant current driver circuit for LED, for carrying out constant current driving to LED load.This constant current driver circuit for LED comprises switch power module, voltage sample module, current sample module, control module and voltage-regulation feedback module; Wherein, described switch power module is used for at least one paths of LEDs load supplying; Described voltage sample module is connected with described switch power module, for gathering the output voltage of described switch power module; Described current sample module is connected with described LED load, exports to the output current of LED load for gathering described switch power module; Described control module is connected with described voltage sample module, current sample module and voltage-regulation feedback module, for according to from the output voltage of described voltage sample module with adjust from the output current of described current sample module the reference voltage exporting to described voltage-regulation feedback module; Described voltage-regulation feedback module is connected with described switch power module, for producing corresponding voltage adjustment signal according to the reference voltage from described control module and this voltage adjustment signal fed back to described switch power module to make described switch power module regulation output voltage.
Preferably, described current sample module comprises at least one current-limiting resistance, and each described current-limiting resistance is series in a paths of LEDs load; Described voltage sample module comprises two dividing potential drop branch roads parallel with one another, and each dividing potential drop branch road comprises two divider resistances of mutually connecting.
Preferably, described control module is provided with a voltage sample input, a D/A output and at least one current sample input; Wherein, described voltage sample input is connected between two divider resistances of a dividing potential drop branch road in described voltage sample module, described D/A output is connected to the input of described voltage-regulation feedback module, and each described current sample input is connected to one end of current-limiting resistance in a paths of LEDs load.
Preferably, described voltage-regulation feedback module comprises voltage error amplifier and photoelectrical coupler; Wherein, described voltage error amplifier comprises operational amplifier and supplementary network, wherein, between the inverting input that described compensating network is parallel to described operational amplifier and output, described inverting input is connected between two divider resistances of another dividing potential drop branch road in described voltage sample module, and described in-phase input end is connected to the D/A output of described control module; The anode of described photoelectrical coupler connects supply power voltage by one first resistance, and its negative electrode is connected to the output of described voltage error amplifier, and the collector electrode of described photoelectrical coupler and emitter are all connected to described switch power module.
In order to solve the problem, the present invention also provides a kind of LED constant current light adjusting circuit, for carrying out constant current driving and light modulation to LED load.This LED constant current light adjusting circuit comprises switch power module, voltage sample module, current sample module, control module, voltage-regulation feedback module and switch module; Wherein, described switch power module is used for at least one paths of LEDs load supplying; Described voltage sample module is connected with described switch power module, for gathering the output voltage of described switch power module; Described current sample module is connected with described LED load, exports to the output current of LED load for gathering described switch power module; Described control module is connected with described voltage sample module, current sample module and voltage-regulation feedback module, for according to from the output voltage of described voltage sample module with adjust from the output current of described current sample module the reference voltage exporting to described voltage-regulation feedback module; Described voltage-regulation feedback module is connected with described switch power module, for producing corresponding voltage adjustment signal according to the reference voltage from described control module and this voltage adjustment signal fed back to described switch power module to make described switch power module regulation output voltage; Described switch module comprises at least one switching device, each described switching device correspondence to be series in a paths of LEDs load and to be controlled by described control module, and described control module is by exporting pwm control signal to realize carrying out light modulation to described LED load to described switching device.
Preferably, described current sample module comprises at least one current-limiting resistance, and each described current-limiting resistance is series in a paths of LEDs load; Described voltage sample module comprises two dividing potential drop branch roads parallel with one another, and each dividing potential drop is propped up route two divider resistance and is in series.
Preferably, described control module is provided with a voltage sample input, a D/A output, at least one current sample input and at least one PWM output; Wherein, described voltage sample input is connected between two divider resistances of a dividing potential drop branch road in described voltage sample module, described D/A output is connected to the input of described voltage-regulation feedback module, each described current sample input is connected to one end of current-limiting resistance in a paths of LEDs load, and each described PWM output is connected to the control end of a paths of LEDs load breaker in middle device.
Preferably, described voltage-regulation feedback module comprises voltage error amplifier and photoelectrical coupler; Wherein, described voltage error amplifier comprises operational amplifier and supplementary network, wherein, between the inverting input that described compensating network is parallel to described operational amplifier and output, described inverting input is connected between two divider resistances of another dividing potential drop branch road in described voltage sample module, and described in-phase input end is connected to the D/A output of described control module; The anode of described photoelectrical coupler connects supply power voltage by one first resistance, and its negative electrode is connected to the output of described voltage error amplifier, and the collector electrode of described photoelectrical coupler and emitter are all connected to described switch power module.
In order to solve the problem, the present invention also provides a kind of control method based on above-mentioned LED constant current light adjusting circuit, and it comprises the following steps:
S1: export a reference voltage preset to voltage-regulation feedback module and measure output voltage and the output current of switch power module simultaneously;
S2: judge whether described output voltage exceedes predetermined maximum voltage value, if the output of then closing switch power module, otherwise carries out next step S3;
S3: judge whether described output current equals pre-set current value, if then carry out next step S4, otherwise increase is exported to the reference voltage of voltage-regulation feedback module and is returned step S2;
S4: detect whether there is the dimming control signal received from outside, if enter next step S5 after then exporting corresponding pwm control signal, otherwise directly carry out next step S5;
S5: judge whether output current equals pre-set current value, if then return step S4, otherwise carries out next step S6;
S6: adjust described reference voltage;
S7: judge whether described output voltage exceedes predetermined maximum voltage value, if the output of then closing switch power module, otherwise returns step S5.
Compared with prior art; constant current driver circuit for LED provided by the present invention; by arranging voltage sample module, current sample module distinguishes output voltage in testing circuit and output current; and under the control of control module; can according to detected size of current real-time Circuit tuning output voltage; to reach the effect arranging the maximum constant current of LED, monitor output voltage to provide overvoltage protection simultaneously.Based on building of above-mentioned simple circuit structure, only needing to be loaded into control module the object that corresponding control program can realize regulating maximum current in advance when producing, increasing substantially production efficiency and circuit working efficiency, bringing good economic benefit.Simultaneously, LED constant current light adjusting circuit provided by the present invention is series switching devices in every paths of LEDs load only, and can be realized the light-modulating mode (i.e. PWM light modulation) switched based on high-speed switch by the switch of control switch device, its structure is simple, efficiency is higher, and product cost is lower.In addition, circuit control method provided by the present invention can be raised the efficiency and be simplified circuit structure, saves product cost.
By following description also by reference to the accompanying drawings, the present invention will become more clear, and these accompanying drawings are for explaining embodiments of the invention.
Accompanying drawing explanation
Fig. 1 illustrates the circuit box structure of constant current driver circuit for LED one embodiment of the present invention.
Fig. 2 illustrates the circuit box structure of LED constant current light adjusting circuit one embodiment of the present invention.
Fig. 3 illustrates the physical circuit figure of the light adjusting circuit of LED constant current shown in Fig. 2.
Fig. 4 is the flow chart of LED constant current light adjusting circuit control method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in embodiment, reference numerals similar in accompanying drawing represents similar assembly.Obviously, be only the present invention's part embodiment below by the embodiment of description, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 illustrates an embodiment of constant current driver circuit for LED of the present invention.
First with reference to Fig. 1, the constant current driver circuit for LED 10 of the present embodiment is for carrying out constant current driving to LED load.This constant current driver circuit for LED 10 comprises switch power module 11, voltage sample module 12, current sample module 13, control module 14 and voltage-regulation feedback module 15; Wherein, described switch power module 11 is for being at least one paths of LEDs load supplying; Described voltage sample module 12 is connected with described switch power module 11, for gathering the output voltage of described switch power module 11; Described current sample module 13 is connected with the outlet side of described switch power module 11, exports to the output current of LED load for gathering described switch power module 11; Described control module 14 is connected with described voltage sample module 12, current sample module 13 and voltage-regulation feedback module 15, and the output current gathered for the output voltage that gathers according to described voltage sample module 12 and described current sample module 13 adjusts the reference voltage exporting to described voltage-regulation feedback module 15; Described voltage-regulation feedback module 15 is connected with described switch power module 11, for producing corresponding voltage adjustment signal according to the reference voltage from described control module 14 and this voltage adjustment signal fed back to described switch power module 11 to make described switch power module 11 regulation output voltage.
Fig. 2 is the block diagram of LED constant current light adjusting circuit one embodiment of the present invention.With reference to Fig. 2, LED constant current light adjusting circuit 20 of the present invention on the basis of above-mentioned constant current driver circuit for LED 10, sets up a switching circuit to realize brightness adjustment control while driving LED load.In the present embodiment, this LED constant current light adjusting circuit 20 comprises switch power module 21, voltage sample module 22, current sample module 23, control module 24, voltage-regulation feedback module 25 and switch module 26.Wherein, described switch power module 21 is for being at least one paths of LEDs load supplying; Described voltage sample module 22 is connected with described switch power module 21, for gathering the output voltage of described switch power module 21; Described current sample module 23 is connected with the outlet side of described switch power module 21, exports to the output current of LED load for gathering described switch power module 21; Described control module 24 is connected with described voltage sample module 22, current sample module 23 and voltage-regulation feedback module 25, and the output current gathered for the output voltage that gathers according to described voltage sample module 22 and described current sample module 23 adjusts the reference voltage exporting to described voltage-regulation feedback module 25; Described voltage-regulation feedback module 25 is connected with described switch power module 21, for producing corresponding voltage adjustment signal according to the reference voltage from described control module 24 and this voltage adjustment signal fed back to described switch power module 21 to make described switch power module 21 regulation output voltage.Described switch module 26 comprises at least one switching device, each described switching device correspondence to be series in a paths of LEDs load and to be controlled by described control module 24, and described control module 24 is by exporting pwm control signal to realize carrying out light modulation to described LED load to described switching device.
With reference to Fig. 3, in the present embodiment, the output three paths of LEDs loads in parallel of described switch power module 21 (SMPS), it is respectively three paths of LEDs lamp string Output1, Output2 and Output3.Correspondingly, described switch module 26 comprises three switching devices, and in the present embodiment, described switching device all selects metal-oxide-semiconductor to provide good switch performance and to reduce power consumption.Three metal-oxide-semiconductors Q1, Q2 and Q3 correspondingly to access in three paths of LEDs lamp string Output1, Output2 and Output3 and are controlled by described control module 24, described control module 24 is by exporting corresponding pwm control signal to control its break-make respectively to three metal-oxide-semiconductors Q1, Q2 and Q3, thus the electric current that have adjusted respectively in three paths of LEDs lamp string Output1, Output2 and Output3, finally realize dimming effect.Understandably, in other embodiments, according to real needs, described switching device also can be selected triode to realize.
Correspondingly, described current sample module 23 comprises three current-limiting resistances R11, R12 and R13, and three described current-limiting resistance R11, R12 and R13 are series at three paths of LEDs lamp string Output1, Output2 and Output3 respectively.In the present embodiment, described voltage sample module 22 comprises two dividing potential drop branch roads parallel with one another, and first dividing potential drop is propped up route divider resistance R4 and R5 and be in series, and second dividing potential drop is propped up route divider resistance R6 and R7 and be in series.Understandably, the resistance quantity in described voltage sample module 22 included by each dividing potential drop branch road is not limited to two, in other embodiments, according to the configuration of side circuit, three or more resistant series can be selected to form.
In some embodiment, such as, in the present embodiment, described control module 24 adopts single-chip microcomputer (MCU) U2 to realize.This single-chip microcomputer U2 is provided with a voltage sample input AN3, a D/A (digital-to-analogue conversion) output DA0, three current sample input AN0, AN1, AN2 and three PWM output PWM0, PWM1, PWM2.Wherein, described voltage sample input AN3 be connected to described voltage sample module 22 two divider resistance R6 and R7 between to obtain the output voltage of described switch power module 21; The input that described D/A output DA0 is connected to described voltage-regulation feedback module 25 is with to its output reference voltage; Three described current sample input AN0, AN1, AN2 connect three paths of LEDs loads respectively, wherein, current sample input AN0 is connected between metal-oxide-semiconductor Q1 and current-limiting resistance R11, current sample input AN1 is connected between metal-oxide-semiconductor Q2 and current-limiting resistance R12, and current sample input AN2 is connected between metal-oxide-semiconductor Q3 and current-limiting resistance R13; Three described PWM outputs are connected to the control end of metal-oxide-semiconductor Q1, Q2 and Q3.
In some embodiment, such as, in the present embodiment, described voltage-regulation feedback module 25 comprises voltage error amplifier and photoelectrical coupler OC1, wherein, described voltage error amplifier comprises operational amplifier U1A and compensating network 251, between the inverting input that described compensating network 251 is parallel to described operational amplifier U1A and output, described inverting input is connected in described voltage sample module 22 between two divider resistance R4 and R5, and described in-phase input end is connected to the D/A output DA0 of described single-chip microcomputer U2; The anode of described photoelectrical coupler OC1 connects supply power voltage by one first resistance R1, and its negative electrode is connected to the output of operational amplifier U1A, and the collector electrode of described photoelectrical coupler OC1 and emitter are all connected to described switch power module 21.In the present embodiment, described compensating network 251 comprises the first electric capacity C1, the second electric capacity C2 and the 3rd resistance R3, wherein, described 3rd resistance R3 connects with the second electric capacity C2 afterwards and described first electric capacity C1 is in parallel and between the inverting input being parallel to described operational amplifier U1A and output, the compensating network 251 based on this design can make circuit stability and the speed of service reach good balance.Certainly, in other embodiments, according to the real needs of loop design, compensating network 251 also can by separately by the first electric capacity C1 or to connect with the second electric capacity C2 separately by the 3rd resistance R3 and realize.
Based on foregoing circuit structure, the operation principle of LED constant current light adjusting circuit of the present invention is as follows: when starting to power on, single-chip microcomputer U2 controls the reference voltage that its D/A output DA0 exports to be increased from small to large gradually, monitored the electric current in No. three load circuits by its current sample input AN0, AN1, AN2 simultaneously, keep the output of D/A output DA0 when reaching setting current value, LED normally works.After LED normally works, single-chip microcomputer U2 keeps the monitoring to electric current, if exceed pre-set current value (can be an interval range), finely tune, if detect that carry out light modulation action, wherein dimming control signal comprises but do not limit following methods from the input of outside dimming control signal: 0-10V simulates light modulation, Wireless Light modulating, digital PWM light modulation etc.The output voltage of single-chip microcomputer U2 also observation circuit while monitoring current, when output voltage exceedes predetermined maximum voltage value, then enters overvoltage protection state, closes and exports.Wherein, pre-set current value is obtained by the rated current preset and the computing of current PWM duty ratio.
With reference to Fig. 4, present invention also offers a kind of control method based on above-mentioned LED constant current light adjusting circuit 20, it specifically comprises the following steps:
S1: export a reference voltage preset to voltage-regulation feedback module and measure output voltage and the output current of switch power module simultaneously;
S2: judge whether described output voltage exceedes predetermined maximum voltage value, if the output of then closing switch power module 21, otherwise carries out next step S3;
S3: judge whether described output current equals pre-set current value, if then carry out next step S4, otherwise increase is exported to the reference voltage of voltage-regulation feedback module and is returned step S2;
S4: detect whether there is the dimming control signal received from outside, if enter next step S5 after then exporting corresponding pwm control signal, otherwise directly carry out next step S5;
S5: judge whether output current equals pre-set current value, if then return step S4, otherwise carries out next step S6;
S6: the reference voltage of voltage-regulation feedback module is exported in adjustment;
S7: judge whether described output voltage exceedes predetermined maximum voltage value, if the output of then closing switch power module 21, otherwise returns step S5.
Above-mentioned control procedure is all be used as executive agent by the control module 24 in LED constant current light adjusting circuit 20, can realize relevant control by being loaded into control program to single-chip microcomputer U2.Wherein, the reference voltage preset be generally 0V or close to the small voltage value of 0V to avoid occurring over-current phenomenon avoidance.Arrive before LED normally works after power-up; reference voltage constantly increases; until the output current detected equals pre-set current value; now LED normally works; single-chip microcomputer U2 keeps the monitoring to output current; if exceed pre-set current value (according to side circuit feature; this pre-set current value is generally an interval range) then finely tune; if detected from the input of outside dimming control signal, carry out light modulation action; when output voltage exceedes predetermined maximum voltage value; then enter overvoltage protection state, close and export.
As mentioned above; constant current driver circuit for LED provided by the present invention; by arranging voltage sample module, current sample module distinguishes output voltage in testing circuit and output current; and under the control of control module; can according to detected size of current real-time Circuit tuning output voltage; to reach the effect arranging the maximum constant current of LED, monitor output voltage to provide overvoltage protection simultaneously.Based on building of above-mentioned simple circuit structure, only needing to be loaded into control module the object that corresponding control program can realize regulating maximum current in advance when producing, increasing substantially production efficiency and circuit working efficiency, bringing good economic benefit.Simultaneously, LED constant current light adjusting circuit provided by the present invention is series switching devices in every paths of LEDs load only, and can be realized the light-modulating mode (i.e. PWM light modulation) switched based on high-speed switch by the switch of control switch device, its structure is simple, efficiency is higher, and product cost is lower.In addition, circuit control method provided by the present invention can be raised the efficiency and be simplified circuit structure, saves product cost.
It should be noted that, the particular circuit configurations of constant current driver circuit for LED 10 breaker in middle power module 11 of the present invention, voltage sample module 12, current sample module 13, control module 14 and voltage-regulation feedback module 15 is all substantially identical with the concrete structure of related circuit module in constant current driver circuit for LED 20 of the present invention, and its unique difference is only pin configuration (without the need to configuring three PWM outputs) and the software control part (without the need to carrying out the control of dimming portion) of the single-chip microcomputer adopted in control module 14.
Wherein, breaker in middle power module 11 and 21 of the present invention mainly comprises input rectifying filter circuit, energy conversion circuit, PWM controller and output rectifier and filter, and its concrete structure and control principle are well known to the skilled person, and do not repeat them here.
Constant current driver circuit for LED 10 of the present invention and the drivable LED load of constant current driver circuit for LED 20 are not limited to the situation described by above-described embodiment, and it also can be used for the load of driving one paths of LEDs, two paths of LED load or more LED load.
More than in conjunction with most preferred embodiment, invention has been described, but the present invention is not limited to the embodiment of above announcement, and should contain various carry out according to essence of the present invention amendment, equivalent combinations.
Claims (10)
1. a constant current driver circuit for LED, for carrying out constant current driving to LED load, is characterized in that: described constant current driver circuit for LED comprises switch power module, voltage sample module, current sample module, control module and voltage-regulation feedback module; Wherein,
Described switch power module is used for at least one paths of LEDs load supplying;
Described voltage sample module is connected with described switch power module, for gathering the output voltage of described switch power module;
Described current sample module is connected with described LED load, exports to the output current of LED load for gathering described switch power module;
Described control module is connected with described voltage sample module, current sample module and voltage-regulation feedback module, for according to from the output voltage of described voltage sample module with adjust from the output current of described current sample module the reference voltage exporting to described voltage-regulation feedback module;
Described voltage-regulation feedback module is connected with described switch power module, for producing corresponding voltage adjustment signal according to the reference voltage from described control module and this voltage adjustment signal fed back to described switch power module to make described switch power module regulation output voltage.
2. constant current driver circuit for LED as claimed in claim 1, it is characterized in that: described current sample module comprises at least one current-limiting resistance, each described current-limiting resistance is series in a paths of LEDs load; Described voltage sample module comprises two dividing potential drop branch roads parallel with one another, and each dividing potential drop branch road comprises two divider resistances of mutually connecting.
3. constant current driver circuit for LED as claimed in claim 2, is characterized in that: described control module is provided with a voltage sample input, a D/A output and at least one current sample input; Wherein, described voltage sample input is connected between two divider resistances of a dividing potential drop branch road in described voltage sample module, described D/A output is connected to the input of described voltage-regulation feedback module, and each described current sample input is connected to one end of current-limiting resistance in a paths of LEDs load.
4. constant current driver circuit for LED as claimed in claim 3, is characterized in that: described voltage-regulation feedback module comprises voltage error amplifier and photoelectrical coupler, wherein,
Described voltage error amplifier comprises operational amplifier and supplementary network, wherein, between the inverting input that described compensating network is parallel to described operational amplifier and output, described inverting input is connected between two divider resistances of another dividing potential drop branch road in described voltage sample module, and described in-phase input end is connected to the D/A output of described control module;
The anode of described photoelectrical coupler connects supply power voltage by one first resistance, and its negative electrode is connected to the output of described voltage error amplifier, and the collector electrode of described photoelectrical coupler and emitter are all connected to described switch power module.
5. a LED constant current light adjusting circuit, for carrying out constant current driving and light modulation to LED load, it is characterized in that: described LED constant current light adjusting circuit comprises switch power module, voltage sample module, current sample module, control module, voltage-regulation feedback module and switch module; Wherein,
Described switch power module is used for at least one paths of LEDs load supplying;
Described voltage sample module is connected with described switch power module, for gathering the output voltage of described switch power module;
Described current sample module is connected with described LED load, exports to the output current of LED load for gathering described switch power module;
Described control module is connected with described voltage sample module, current sample module and voltage-regulation feedback module, for according to from the output voltage of described voltage sample module with adjust from the output current of described current sample module the reference voltage exporting to described voltage-regulation feedback module;
Described voltage-regulation feedback module is connected with described switch power module, for producing corresponding voltage adjustment signal according to the reference voltage from described control module and this voltage adjustment signal fed back to described switch power module to make described switch power module regulation output voltage;
Described switch module comprises at least one switching device, each described switching device correspondence to be series in a paths of LEDs load and to be controlled by described control module, and described control module is by exporting pwm control signal to realize carrying out light modulation to described LED load to described switching device.
6. LED constant current light adjusting circuit as claimed in claim 5, it is characterized in that: described current sample module comprises at least one current-limiting resistance, each described current-limiting resistance is series in a paths of LEDs load; Described voltage sample module comprises two dividing potential drop branch roads parallel with one another, and each dividing potential drop is propped up route two divider resistance and is in series.
7. LED constant current light adjusting circuit as claimed in claim 6, is characterized in that: described control module is provided with a voltage sample input, a D/A output, at least one current sample input and at least one PWM output; Wherein, described voltage sample input is connected between two divider resistances of a dividing potential drop branch road in described voltage sample module, described D/A output is connected to the input of described voltage-regulation feedback module, each described current sample input is connected to one end of current-limiting resistance in a paths of LEDs load, and each described PWM output is connected to the control end of a paths of LEDs load breaker in middle device.
8. LED constant current light adjusting circuit as claimed in claim 7, is characterized in that: described voltage-regulation feedback module comprises voltage error amplifier and photoelectrical coupler, wherein,
Described voltage error amplifier comprises operational amplifier and supplementary network, wherein, between the inverting input that described compensating network is parallel to described operational amplifier and output, described inverting input is connected between two divider resistances of another dividing potential drop branch road in described voltage sample module, and described in-phase input end is connected to the D/A output of described control module;
The anode of described photoelectrical coupler connects supply power voltage by one first resistance, and its negative electrode is connected to the output of described voltage error amplifier, and the collector electrode of described photoelectrical coupler and emitter are all connected to described switch power module.
9. the LED constant current light adjusting circuit as described in any one of claim 5-8, is characterized in that: described switching device is metal-oxide-semiconductor.
10., based on a control method for the LED constant current light adjusting circuit described in any one of claim 5-8, it is characterized in that, comprise the following steps:
S1: export a reference voltage preset to voltage-regulation feedback module and measure output voltage and the output current of switch power module simultaneously;
S2: judge whether described output voltage exceedes predetermined maximum voltage value, if the output of then closing switch power module, otherwise carries out next step S3;
S3: judge whether described output current equals pre-set current value, if then carry out next step S4, otherwise increase is exported to the reference voltage of voltage-regulation feedback module and is returned step S2;
S4: detect whether there is the dimming control signal received from outside, if enter next step S5 after then exporting corresponding pwm control signal, otherwise directly carry out next step S5;
S5: judge whether output current equals pre-set current value, if then return step S4, otherwise carries out next step S6;
S6: adjust described reference voltage;
S7: judge whether described output voltage exceedes predetermined maximum voltage value, if the output of then closing switch power module, otherwise returns step S5.
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| CN107231719A (en) * | 2016-03-25 | 2017-10-03 | 华润矽威科技（上海）有限公司 | LED driving light modulation feedback control circuits |
| CN106251811A (en) * | 2016-08-12 | 2016-12-21 | 江西康铭盛光电科技有限公司 | A kind of LED light-dimming method |
| CN106205504A (en) * | 2016-08-12 | 2016-12-07 | 江西康铭盛光电科技有限公司 | A kind of LED backlight light adjusting system |
| WO2018040420A1 (en) * | 2016-08-31 | 2018-03-08 | 深圳Tcl数字技术有限公司 | Backlight driver and television |
| WO2018107779A1 (en) * | 2016-12-15 | 2018-06-21 | 威创集团股份有限公司 | Led driver circuit |
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| CN106954308B (en) * | 2017-04-19 | 2023-12-22 | 赛尔富电子有限公司 | Minimum output current's of LED power regulation system that adjusts luminance |
| CN106954308A (en) * | 2017-04-19 | 2017-07-14 | 赛尔富电子有限公司 | A kind of regulation system of LED dimming power sources minimum output current |
| CN107342059A (en) * | 2017-08-31 | 2017-11-10 | 京东方科技集团股份有限公司 | A kind of current control circuit and control method, backlight module, display device |
| CN107342059B (en) * | 2017-08-31 | 2019-07-23 | 京东方科技集团股份有限公司 | A kind of current control circuit and control method, backlight module, display device |
| CN107889313A (en) * | 2017-11-30 | 2018-04-06 | 苏州灵猴机器人有限公司 | The control method of current mode light-source control system and the application system |
| CN107820347A (en) * | 2017-11-30 | 2018-03-20 | 欧普照明股份有限公司 | A kind of driving power and lighting device |
| CN109922557A (en) * | 2017-12-13 | 2019-06-21 | 深圳Tcl新技术有限公司 | A kind of multipath LED constant current drive circuit, driving device and electrical equipment |
| CN108320691A (en) * | 2018-03-27 | 2018-07-24 | 苏州佳智彩光电科技有限公司 | A kind of over-current over-voltage protection method and system when the test for OLED screen |
| CN108449840A (en) * | 2018-04-26 | 2018-08-24 | 深圳市立智达光电科技有限公司 | A kind of LED drive system |
| CN108696975A (en) * | 2018-05-15 | 2018-10-23 | 安徽天卓信息技术有限公司 | A kind of fault monitoring system of tunnel lighting system |
| CN108736706A (en) * | 2018-08-01 | 2018-11-02 | 杭州老板电器股份有限公司 | Controllable switch power supply and purification water tank comprising the power supply |
| CN109444583A (en) * | 2018-11-09 | 2019-03-08 | 加弘科技咨询(上海)有限公司 | External module detects in place and method for controlling power supply, device and electronic equipment |
| CN111669873A (en) * | 2019-02-20 | 2020-09-15 | 江苏师范大学 | LED emergency lamp |
| CN111669875A (en) * | 2019-02-20 | 2020-09-15 | 江苏师范大学 | Control method of LED emergency lamp |
| CN110113846A (en) * | 2019-06-17 | 2019-08-09 | 无锡格兰德微电子科技有限公司 | A kind of LED light adjusting system of adaptive different capacity section |
| CN110113846B (en) * | 2019-06-17 | 2024-05-03 | 无锡格兰德微电子科技有限公司 | LED dimming system of self-adaptation different power sections |
| CN111240272A (en) * | 2019-09-24 | 2020-06-05 | 浙江中自机电控制技术有限公司 | Trademark machine cutting knife ironing board controller |
| CN114586472A (en) * | 2019-10-15 | 2022-06-03 | 法雷奥照明公司 | Illumination system comprising a pixelated light source and a current sensor |
| CN110996457A (en) * | 2019-12-31 | 2020-04-10 | 惠州视维新技术有限公司 | LED drive circuit, device, LED control protection method and storage medium |
| CN110996457B (en) * | 2019-12-31 | 2023-05-23 | 惠州视维新技术有限公司 | LED driving circuit, device, LED control protection method and storage medium |
| CN111163564A (en) * | 2020-01-10 | 2020-05-15 | 东莞锐视光电科技有限公司 | Method for stably controlling current in light source |
| CN111542156A (en) * | 2020-05-13 | 2020-08-14 | 马少峰 | Dimmable LED constant current source driving circuit |
| CN114114112A (en) * | 2020-09-01 | 2022-03-01 | 西门子(深圳)磁共振有限公司 | Input voltage regulating circuit and method of coil and magnetic resonance imaging system |
| CN114114112B (en) * | 2020-09-01 | 2023-08-29 | 西门子(深圳)磁共振有限公司 | Coil input voltage regulating circuit, method and magnetic resonance imaging system |
| CN112965003A (en) * | 2021-02-01 | 2021-06-15 | 佛山市博顿光电科技有限公司 | Power supply aging load circuit |
| CN112965003B (en) * | 2021-02-01 | 2024-04-30 | 佛山市博顿光电科技有限公司 | Power supply aging load circuit |
| CN112882560A (en) * | 2021-02-04 | 2021-06-01 | Oppo广东移动通信有限公司 | Power management method, power supply device, electronic apparatus, and storage medium |
| CN112882560B (en) * | 2021-02-04 | 2024-05-03 | Oppo广东移动通信有限公司 | Power management method, power device, electronic apparatus, and storage medium |
| CN113110671B (en) * | 2021-04-16 | 2022-08-23 | 浙江正泰中自控制工程有限公司 | Variable power consumption analog quantity current output circuit for control system |
| CN113110671A (en) * | 2021-04-16 | 2021-07-13 | 浙江正泰中自控制工程有限公司 | Variable power consumption analog quantity current output circuit for control system |
| CN114466482B (en) * | 2021-12-31 | 2023-12-29 | 珠海雷特科技股份有限公司 | LED constant current source circuit and control method thereof |
| CN114466482A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | LED constant current source circuit and control method thereof |
| CN114466478A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | Method for accelerating LED power supply development through integration |
| CN114740935A (en) * | 2022-05-06 | 2022-07-12 | 江苏伟博智能装备科技有限公司 | Direct current feedback regulation control circuit |
| CN114740935B (en) * | 2022-05-06 | 2023-12-01 | 江苏伟博智能装备科技有限公司 | Direct current feedback regulation control circuit |
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